darkkirb/old-cross-binutils
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Author SHA1 Message Date
H.J. Lu
04ebc307f9 Skip PLT for function pointer initialization 
We use its PLT entry to initialize function pointer at run-time.  If
there is no other usage for the PLT entry, we can generate run-time
function pointer relocations in read-write section, which can be
resolved by dynamic linker, to initialize function pointers.  It avoids
the extra indirect branch overhead in PLT.

bfd/

	PR ld/18900
	* elf32-i386.c (elf_i386_link_hash_entry): Add
	func_pointer_refcount.
	(elf_i386_link_hash_newfunc): Clear func_pointer_refcount.
	(elf_i386_get_local_sym_hash): Likewise.
	(elf_i386_copy_indirect_symbol): Also copy
	func_pointer_refcount.
	(elf_i386_check_relocs): Increment func_pointer_refcount.
	(elf_i386_gc_sweep_hook): Decrement func_pointer_refcount.
	(elf_i386_allocate_dynrelocs): Don't create the PLT entry if
	there are only function pointer relocations which can be
	resolved at run-time.  Keep dynanamic relocations for run-time
	function pointer initialization.
	(elf_i386_relocate_section): Copy dynamic function pointer
	relocations.
	* elf64-x86-64.c (elf_x86_64_link_hash_entry): Add
	func_pointer_refcount.
	(elf_x86_64_link_hash_newfunc): Clear func_pointer_refcount.
	(elf_x86_64_get_local_sym_hash): Likewise.
	(elf_x86_64_copy_indirect_symbol): Also copy
	func_pointer_refcount.
	(elf_x86_64_check_relocs): Increment func_pointer_refcount.
	(elf_x86_64_gc_sweep_hook): Decrement func_pointer_refcount.
	(elf_x86_64_allocate_dynrelocs): Don't create the PLT entry if
	there are only function pointer relocations which can be
	resolved at run-time.  Keep dynanamic relocations for run-time
	function pointer initialization.
	(elf_x86_64_relocate_section): Copy dynamic function pointer
	relocations.

ld/testsuite/

	PR ld/18900
	* ld-i386/i386.exp: Run tests for PR ld/18900.
	* ld-x86-64/x86-64.exp: Likewise.
	* ld-i386/pr18900.out: New file.
	* ld-i386/pr18900a.c: Likewise.
	* ld-i386/pr18900a.c: Likewise.
	* ld-i386/pr18900a.rd: Likewise.
	* ld-i386/pr18900b.c: Likewise.
	* ld-i386/pr18900b.rd: Likewise.
	* ld-i386/pr18900c.c: Likewise.
	* ld-x86-64/pr18900.out: Likewise.
	* ld-x86-64/pr18900a.c: Likewise.
	* ld-x86-64/pr18900a.rd: Likewise.
	* ld-x86-64/pr18900b.c: Likewise.
	* ld-x86-64/pr18900b.rd: Likewise.
	* ld-x86-64/pr18900c.c: Likewise.
	* ld-x86-64/mpx3.dd: Updated.
 2015-09-01 05:06:33 -07:00
Igor Zamyatin
d258b82828 Add -z bndplt to generate BND prefix in PLT entries 
This patch adds "-z bndplt" option Linux/x86-64 linker to generate BND
prefix in PLT entries.  It also updated Linux/x86-64 assembler not to
generate R_X86_64_PLT32_BND nor R_X86_64_PC32_BND relocations.

bfd/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* elf64-x86-64.c (elf_x86_64_check_relocs): Enable MPX PLT only
	for -z bndplt.

gas/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* config/tc-i386-intel.c (i386_operator): Remove last argument
	from lex_got call.
	* config/tc-i386.c (reloc): Remove bnd_prefix from parameters'
	list.  Return always BFD_RELOC_32_PCREL.
	* (output_branch): Remove condition for BFD_RELOC_X86_64_PC32_BND.
	* (output_jump): Update call to reloc accordingly.
	* (output_interseg_jump): Likewise.
	* (output_disp): Likewise.
	* (output_imm): Likewise.
	* (x86_cons_fix_new): Likewise.
	* (lex_got): Remove bnd_prefix from parameters' list in macro and
	declarations. Don't use BFD_RELOC_X86_64_PLT32_BND.
	* (x86_cons): Update call to lex_got accordingly.
	* (i386_immediate): Likewise.
	* (i386_displacement): Likewise.
	* (md_apply_fix): Don't use BFD_RELOC_X86_64_PLT32_BND nor
	BFD_RELOC_X86_64_PC32_BND.
	* (tc_gen_reloc): Likewise.

include/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* bfdlink.h (struct bfd_link_info): Add bndplt.

ld/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* emulparams/elf_x86_64.sh (BNDPLT): Set to yes for x86_64.
	* emultempl/elf32.em (gld${EMULATION_NAME}_handle_option): Handle
	"-z bndplt" if BNDPLT is yes.
	(gld${EMULATION_NAME}_list_options): Add "-z bndplt" entry.
	* ld.texinfo: Add description for bndplt.

ld/testsuite/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* testsuite/ld-x86-64/bnd-ifunc-1.d: Add bndplt option.
	* testsuite/ld-x86-64/bnd-ifunc-2.d: Likewise.
	* testsuite/ld-x86-64/bnd-plt-1.d: Likewise.  Update dissassembly
	sections.
	* testsuite/ld-x86-64/mpx.exp: Handle mpx3 and mpx4 tests.
	* testsuite/ld-x86-64/mpx1a.rd: Remove _BND from relocation name.
	* testsuite/ld-x86-64/mpx1c.rd: Likewise.
	* testsuite/ld-x86-64/mpx2a.rd: Likewise.
	* testsuite/ld-x86-64/mpx2c.rd: Likewise.
	* testsuite/ld-x86-64/mpx3.dd: New file.
	* testsuite/ld-x86-64/mpx3a.s: Likewise.
	* testsuite/ld-x86-64/mpx3b.s: Likewise.
	* testsuite/ld-x86-64/mpx4.dd: Likewise.
	* testsuite/ld-x86-64/mpx4a.s: Likewise.
	* testsuite/ld-x86-64/mpx4b.s: Likewise.
 2014-11-18 05:40:17 -08:00